<template>
  <div>
    <!-- 顶部滑动条区域 -->
    <div id="slider" class="mui-slider">
      <div
        id="sliderSegmentedControl"
        class="mui-scroll-wrapper mui-slider-indicator mui-segmented-control mui-segmented-control-inverted"
      >
        <div class="mui-scroll">
          <a
            :class="['mui-control-item ',item.id==0 ? 'mui-active' : '']"
            v-for="item in cates"
            :key="item.title"
            @tap="getPhotoListByCateId(item.id)"
          >{{item.title}}</a>
        </div>
      </div>
    </div>
    <!-- 图片列表区域 -->
    <ul class="photo-list">
      <routerLink v-for="item in list" :key="item.id" :to="'/home/photoinfo/'+item.id" tag="li">
        <img v-lazy="item.img_url" />
        <div class="info">
            <h1 class="info-title">{{ item.title }}</h1>
            <div class="info-body">{{ item.zhaiyao }}</div>
        </div>
      </routerLink>
    </ul>
  </div>
</template>


<script>
// 1. 导入mui的js文件
import mui from "../../lib/mui/js/mui.js";
import { Toast } from "mint-ui";
export default {
  data() {
    return {
      cates: [], //  所有分类的列表数组
      list: [] //图片列表的数组
    };
  },
  created() {
    this.getAllCategory();
    this.getPhotoListByCateId(0);
  },
  mounted() {
    //  当组件中的DOM结构被渲染好并放到页面之后，会执行这个钩子函数
    //  如果要操作元素了，最好在mounted里面，因为，这时候的DOM元素是最新的
    // 2. 初始化滑动控件
    mui(".mui-scroll-wrapper").scroll({
      deceleration: 0.0005 //flick 减速系数，系数越大，滚动速度越慢，滚动距离越小，默认值0.0006
    });
  },
  methods: {
    getAllCategory() {
      // 获取所有的图片分类
      this.$http.get("api/getimgcategory").then(result => {
        if (result.body.status === 0) {
          result.body.message.unshift({ title: "全部", id: 0 });
          console.log(result.body.message);

          this.cates = result.body.message;
        } else {
          Toast("获取图片分类失败");
        }
      });
    },
    getPhotoListByCateId(cateId) {
      //  根据分类id，获取图片列表
      this.$http.get("api/getimages/" + cateId).then(result => {
        if (result.body.status === 0) {
          this.list = result.body.message;
        } else {
          Toast("获取图片失败");
        }
      });
    }
  }
};
</script>


<style lang="scss" scoped>
* {
  touch-action: pan-y;
}
.photo-list {
    list-style: none;
    margin: 0;
    padding: 10px;
    padding-bottom: 0;
  li {
      background-color: #ccc;
      text-align: center;
      margin-bottom: 10px;
      box-shadow: 0 0 9px #999;
      position: relative;
      img{
          width: 100%;
          vertical-align: middle;
      }
    img[lazy="loading"] {
      width: 40px;
      height: 300px;
      margin: auto;
    }
    .info{
        color: white;
        max-height: 84px;
        text-align: left;
        position: absolute;
        bottom: 0;
        background-color: rgba(0,0,0,0.4);
        .info-title{
            font-size: 14px;
        }
        .info-body{
            font-size: 13px;
        }
    }
  }
}
img[lazy="loading"] {
  width: 40px;
  height: 300px;
  margin: auto;
}
</style>
